The length of AB (the minor arc) is 40 cm. What is the circumference of C?
А
60°C
B
A. 24 cm
O
B. 6.67 cm
C. 240 cm
O D. 60 cm
Ο Ο Ο O
O E. 360 cm
F. 120 cm
Non-euclidean geometry was discovered when, in seeking cleaner alternatives to the fifth postulate, it was found that the negation could also be true a. true b. false